Multiplex communications – Wide area network – Packet switching
Patent
1992-05-27
1994-11-29
Safourek, Benedict V.
Multiplex communications
Wide area network
Packet switching
370 68, 371 151, H04J 314
Patent
active
053696336
ABSTRACT:
A digital signal transmission system having monitor equipment including a serial/parallel (S/P) converter and a parallel/serial (P/S) converter both. The S/P converter is checked by the aid of a first monitor signal generating circuit that parallel distributes a pass pattern signal given at the input side of the S/P converter to respective individual channel lines for achieving a pass pattern check. The P/S converter is checked with the aid of a second monitor signal generating circuit that receives respective pass pattern signals given, at the input side of the P/S converter, to a multiplexed channel line sequentially at every frame to achieve a pass pattern check.
REFERENCES:
patent: 4022979 (1977-05-01), Smith
patent: 4296492 (1981-10-01), Hafer
patent: 4455647 (1984-06-01), Gueldner
patent: 5138608 (1992-08-01), Kucera et al.
Hanaeda Kazunori
Kimura Shuji
Maruyama Akira
Nara Hiroichi
Shirai Hiroaki
Fujitsu Limited
Safourek Benedict V.
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